One patrol consisted of the two armed merchant ships Constantia and Caritas, each with a crew of 90 men, under the command of Pål Rump.

The Danes quickly received intelligence that two Swedish ships were moving in the southern Baltic Sea and the Danish fleet was sailing north. It wasn’t long before the two Swedish ships were sighted. Commander Rump of Constantia immediately realised that he would not have time to round Utlängan and sneak up into Kalmarsund.

After gun fire was exchanged, the two Swedish ships retreated among the islands in Blekinge’s eastern archipelago. The crew brought the ships further and further into shallower waters. Awkwardly enough for the Swedes, the Danes followed suit with three smaller ships, with orders to try and capture the Swedish ships.

Not wanting the ships to fall into the hands of the Danes, Rump made sure that both Constantia and Caritas were prepared to be set on fire.

On 23 April, the Danes attacked. Constantia opened fire with her guns, but when darkness fell the Swedes could no longer defend themselves. Under the cover of darkness, the crews left their ships and Rump ordered the gunpowder to be ignited. Constantia exploded almost immediately. But in the glow of the burning ship, the Danes saw Caritas and quickly made their way there. The first to board Caritas managed to put out the burning fuse, and so the ship was successfully conquered.